Article
Physics, Fluids & Plasmas
Jon Martinez-Carrascal, J. Calderon-Sanchez, L. M. Gonzalez-Gutierrez, A. de Andrea Gonzalez
Summary: This article extends the classical Rayleigh-Taylor instability to situations where the fluid is completely confined, analyzing the effect of adding surface tension to the interface in a 2D viscous periodic case. The study compares the linear stability analysis obtained through Navier-Stokes equations and WCSPH method, showing remarkable agreement in simulations with different tank sizes and Atwood numbers.
Article
Mechanics
H. R. Abbasi, R. Lubbad
Summary: A three-dimensional numerical model based on the SPH method has been developed and successfully validated for simulating interactions between oil and sea ice. The model accurately predicts the interaction between oil slicks and ice floes, and investigates the effects of various factors on oil slick accumulation.
Article
Engineering, Multidisciplinary
P. Rastelli, R. Vacondio, J. C. Marongiu
Summary: This work proposes an ALE-SPH scheme with an IIPS correction to optimize the particle distribution and improve the accuracy of SPH spatial operators. Two different approaches based on MLS and convective fluxes are adopted to embed the IIPS formulation in the ALE-SPH scheme. The proposed numerical scheme achieves a second-order convergence rate for the Taylor-Green flow at Re = 100 and shows significantly improved accuracy compared to existing quasi-Lagrangian ALE-SPH schemes in the Moving box and Impinging jet test cases.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Automation & Control Systems
Yujendra Mitikiri, Matthew Silic, Kamran Mohseni
Summary: This article analyzes the relationship between parameters in the equations of motion and the properties of a swarm of robots, introducing a new interaction potential to control robot-robot separation and maintain swarm cohesion. The constructed interaction potential is conservative and can establish overall swarm stability through passivity arguments in the presence of a dissipative process. The proposed controller's features are verified through simulations and experiments using real physical airplanes.
IEEE TRANSACTIONS ON CONTROL OF NETWORK SYSTEMS
(2021)
Article
Mechanics
Tibing Xu, Yee-Chung Jin, Yih-Chin Tai
Summary: A coupled model of Peridynamics into the mesh-free method was used to simulate the impacting collapse of a granular column with various suspended heights. The simulated free surface profiles were in good agreement with experimental measurements, and the numerical model was validated by simulating the granular column collapse and comparing the kinetic energy and potential energy with DEM simulation results. The analysis revealed that the suspended height in the impacting collapse of the granular column significantly affects energy dissipation.
Article
Engineering, Multidisciplinary
Md Rushdie Ibne Islam, Kona Veera Ganesh, Puneet Kumar Patra
Summary: Significant advances in nanoscale research have enabled the continued miniaturization of devices. This study aims to investigate the equivalence between continuum scale methods and atomistic scale molecular dynamics (MD) simulations. Through four simple problems, the results demonstrate that under certain conditions, the continuum scale methods provide qualitatively and quantitatively consistent results with MD simulations.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
P. N. Sun, C. Pilloton, M. Antuono, A. Colagrossi
Summary: The proposed work introduces a new viscous term to reduce acoustic pressure waves in weakly-compressible SPH models. Compared to existing regularizing terms in SPH literature, this term enables noise-free simulations while maintaining the advantages of explicit schemes. Numerical results demonstrate its effectiveness in flow simulations with different weakly-compressible SPH models.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Engineering, Multidisciplinary
Abbas Khayyer, Yuma Shimizu, Hitoshi Gotoh, Ken Nagashima
Summary: This paper presents a fully Lagrangian meshfree projection-based hydroelastic FSI solver within the SPH framework for simulating incompressible fluid flows interacting with laminated composite elastic structures. The solver utilizes an enhanced version of Incompressible SPH for fluids and a structure model in the context of Hamiltonian SPH for laminated composite elastic structures. The solver demonstrates superior performance without artificial stabilizers or smoothing of material properties at material interfaces, and its potential applicability for practical engineering applications is highlighted through challenging simulations.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Physics, Nuclear
Peter Diener, Stephan Rosswog, Francesco Torsello
Summary: This study presents the first neutron star merger simulations using the newly developed code SPHINCS_BSSN. The code evolves spacetime using the BSSN formulation and matter using the Smooth Particle Hydrodynamics (SPH) method. Several new methodological elements were introduced to model neutron star mergers, including spacetime-mesh refinement, changes in the particle-mesh mapping algorithm, and a novel way to construct SPH initial data using the Artificial Pressure Method.
EUROPEAN PHYSICAL JOURNAL A
(2022)
Article
Nanoscience & Nanotechnology
Tao Zhang, Tieshuan Zhuang, Chao Gao, Xiangwei Dong
Summary: This study developed a multi-media coupled model to simulate the interaction between underwater explosion and discrete objects. The numerical stability was improved by adding artificial viscous term and density dissipation term. The results showed that the discrete objects affected the propagation and diffusion of shock waves and enhanced the damage effect on the structure.
Article
Mechanics
Kai-Li Zhao, Liu-Chao Qiu, Yi Liu
Summary: A computational model based on the two-layer two-phase material point method (MPM) is developed in this study to simulate tsunamis generated by granular landslides. The model successfully captures the soil-water interaction, large deformation of soil, and fluidization and sedimentation of sand. By simulating benchmark problems and comparing the computed results with analytical solutions and laboratory test data, the effectiveness of the proposed model is verified. Additionally, the influence of different soil material parameters on the water wave generated by subaerial granular landslides is investigated.
Article
Computer Science, Interdisciplinary Applications
Mohammad Nikooei, Mehrdad T. Manzari
Summary: This paper numerically studies the interaction of flowing granular material with an entrainable granular bed, and characterizes the rheological behavior of the granular mixture using a generalized viscoplastic model. The effect of dynamics of entrained bedtype particles on rheology is considered, with discretization of flow equations using Incompressible Smoothed Particle Hydrodynamics method. Benchmark problems are solved to assess accuracy, and the impact of mixing effect on various model parameters is studied, with reported variations in momentum, velocity, and total kinetic energy of flow with time.
COMPUTERS & GEOSCIENCES
(2021)
Editorial Material
Physics, Applied
Wu-Gui Jiang, Pan Zheng, Shu-Mei Liao, Hui Lv
Summary: This paper provides comments and clarifications on the inaccurate mathematical descriptions regarding energy conservation in the SPH simulation of laser melting processes published by Muhammad et al in 2013. By correcting these errors, a deeper understanding of energy transport during laser melting processes can be achieved.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Marine
George Dafermos, George Zaraphonitis
Summary: The survivability of damaged ships is of great importance and the regulatory framework is constantly updated. The introduction of the probabilistic damage stability framework has rationalized the assessment procedure. Flooding simulation tools can be used to investigate the dynamic response of damaged ships.
Article
Computer Science, Interdisciplinary Applications
M. Antuono, P. N. Sun, S. Marrone, A. Colagrossi
Summary: The behaviour of a weakly-compressible SPH scheme obtained by rewriting the Navier-Stokes equations in an arbitrary Lagrangian-Eulerian (ALE) format is studied. The proposed model is expressed in terms of primitive variables (density and velocity) and is written using the standard differential formulations of weakly-compressible SPH schemes. The scheme can be stabilized by including appropriate diffusion terms in both the equations of density and mass.
COMPUTERS & FLUIDS
(2021)
Article
Engineering, Geological
Guowei Ma, Chen Huang, Junfei Zhang
Summary: In this study, a 3D printed underground tunnel model was fabricated to simulate its failure mode, and piezoelectric transducers were embedded in the surrounding rock for monitoring and evaluation. The results showed that as the load increased, cracks appeared above the tunnel roof and below the floor, and then coalesced into the tunnel boundary, ultimately leading to the model's failure. This research is significant for damage identification and residual strength estimation of other 3D printed structures in civil engineering.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Construction & Building Technology
Huidong Wang, Fengfeng Song, Yun Chen, Tuo Li, Guowei Ma
Summary: The extended key block theory proposed in this study considers the forces between blocks and block rotation, which improves the accuracy and efficiency of analyzing the stability of fractured rock masses. By incorporating a displacement constraint method and analyzing block rotatability, the extended method provides more accurate forces between blocks and considers the influence of block rotation on stability.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Geological
Xuefei Wang, Chi Cheng, Jianmin Zhang, Guowei Ma, Jiale Li, Jinzhao Jin
Summary: The quality control of subgrade compaction depends on post-evaluations. The potential bias is caused by the limited coverage of spot tests at the construction site. Intelligent compaction is developed by integrating the sensing system on the vibratory roller and used at the construction site of the Rongwu highway to monitor the compaction quality in real time. The compaction meter value (CMV) is recorded for three months. The sand cone tests are performed following the roller passes. The CMV is proven to be proportional to the roller pass, and it is feasible to represent the compactness of subgrade soils. The linear regression model is developed based on the in situ measured compactness first. An artificial neural network (ANN) model is proposed to correlate the CMV and the compactness by considering the influences of soil properties and control parameters. The prediction model demonstrates good correlations. This study aims to establish a reliable model to improve the feasibility of IC, filling the gap between the continuously recorded CMV and the compactness. This model is to be integrated into the IC system for real-time assessing the compaction quality of subgrade.
Article
Construction & Building Technology
Guowei Ma, Tingyu Hu, Fang Wang, Xiongfei Liu, Zhijian Li
Summary: This paper develops a systematic approach to evaluate and optimize the printability and printing quality of powder-based 3D magnesium phosphate cement (MPC) printing. The results show that mapping the proportions of ingredients and using specific modulators can improve printing accuracy and surface quality. The addition of 1,2-propylene glycol and Surfynol 465 to the binder, and quartz sand to the powder bed, significantly enhances the viscosity, reduces surface tension, and improves spreadability and surface flatness. The use of appropriate content of polyvinyl alcohol (PVA) controls the penetration and diffusion of the binder, leading to improved printing accuracy and reduced porosity.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Yushi Liu, Weichen Tian, Guowei Ma
Summary: In this study, electric activation (EA) curing was used to rapidly manufacture on-site reinforced concrete (RC) beams in severely-cold environment. The results showed that EA cured beams maintained a stable increasing trend in electrical resistance during the entire curing process, and the temperature field inside the structure remained uniform at around 45 degrees Celsius. Mechanical property tests demonstrated that EA curing could rapidly enhance the strength of RC beams under severely-cold conditions, reaching a compressive strength of 28.4 MPa, equivalent to C30 concrete grade. Furthermore, the structural performance of EA manufactured RC beams was found to be superior to beams manufactured through standard curing methods. This research provides a comprehensive investigation into the performance development of RC beams subjected to EA curing in extremely-harsh environments, facilitating the rapid fabrication of high-quality concrete structures in cold regions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yang Liu, Zhihua Liu, Hui Rong, Guowei Ma
Summary: This paper investigates the effect of stirring and foaming of culture medium solution and microbial solution under the same incubation conditions, as well as the factors affecting microbial foaming. It also explores the mechanical properties of foam concrete prepared by different preparation processes using a microbial foaming agent. The results show that the foaming nature of microbial foaming agents is the result of the synergistic effect of microorganisms, nutrients, and microbial metabolites. The foam concrete prepared by the prefabricated foam method exhibits better performance compared to the direct mixing method, meeting industry standards and having a uniform pore size distribution.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Guowei Ma, Yun Chen, Wei Dong, Man Xu, Tuo Li, Huidong Wang
Summary: This study develops a unified pipe-network method to investigate the mechanism of nuclide migration in rough-walled fractures with filling properties. Analytical results are used to verify the numerical reliability of the model. A case study is conducted at the Xinchang (Beishan) site to investigate the migration process of U-238 in a fracture-network system. A safety classifier based on numerical results is developed to effectively evaluate the avoidance distance between the repository and the water-conducting zone.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Ruo-Chen Zhang, Li Wang, Xuan Xue, Guo-Wei Ma
Summary: Three-dimensional concrete printing (3DCP) is an advantageous construction method in harsh environments, such as deserts. This study conducted a life cycle assessment to determine the environmental impact profile of 3DCP in desert areas. The comparison results show that 3DCP is more sustainable with lower environmental impacts compared to conventional construction methods.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Civil
Chunlei Ma, Yun Chen, Xiaoliang Tong, Guowei Ma
Summary: A piecewise equivalent model is developed to characterize the relationship between primary and secondary roughness and flow rate inside the fracture, setting the fractal dimension 2.0 as the piecewise point. The rough-walled fracture influenced by the primary and secondary roughness is quantitatively evaluated based on the wavelet transform and the power spectrum method. Secondary roughness greatly enhances flow non-linearity when the fracture fractal dimension exceeds 2.0, while it has little effect on non-linear flow behavior with the fracture fractal dimension less than 2.0.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Manufacturing
Qian Wan, Wenwei Yang, Li Wang, Guowei Ma
Summary: 3D concrete printing is a promising construction technology for freeform civil structures. This study proposes an adaptive path-planning method based on medial-axis decomposition and transfinite mapping for multi-branched regions. The proposed method can eliminate discontinuity, minimize sharp turns, and avoid defects in solid filling, and support various types of grid generation with desired global continuity.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Li Wang, Kehan Ye, Qian Wan, Zhijian Li, Guowei Ma
Summary: In order to improve the adaptability of 3D concrete printing to freeform and topologically optimized pre-fabricated structures, inclined 3D printing for overhang structures is developed. The study establishes prediction criteria for stable buildability of additive stacking to facilitate inclined 3D printing. The approach of compounding retarder and accelerator simultaneously is adopted to optimize the working performance of 3D printed concrete materials.
ADDITIVE MANUFACTURING
(2023)
Article
Construction & Building Technology
Yimiao Huang, Zehui Huo, Guowei Ma, Lei Zhang, Fang Wang, Junfei Zhang
Summary: This study developed a multi-objective optimization (MOO) model combining the tree-based ensemble learning algorithm and non-dominated sorting genetic algorithm (NSGA-II) to solve the optimization problem of fly ash-slag based geopolymers. The MOO model was trained on a database collected from published literature with 676 mixture proportions. The UCS of fly ash-slag based geopolymers were modeled using different regressors, with the gradient boosted regressor showing the highest prediction accuracy (R = 0.966, RMSE = 5.295 MPa).
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Mechanical
Hongyuan Zhou, Jiale Fan, Xiaojuan Wang, Guowei Ma, Shangjiang Yu, Yonghui Wang
Summary: In this study, a sacrificial cladding with foam concrete filled aluminum tube as the core is proposed for structural protection against blast load. The energy absorption capacity of the cladding is experimentally investigated through quasi-static compressive test and blast test. Numerical investigations are also conducted to analyze the effect of foam concrete density, aluminum tube thickness, and tube spacing on the cladding's protective performance. The results show that foam concrete density and tube squeezing significantly influence the energy absorption capacity, and increasing foam concrete density improves the protective performance. Increasing foam concrete density and aluminum tube thickness, and reducing tube spacing can effectively reduce the energy input to the system.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Construction & Building Technology
Yushi Liu, Weichen Tian, Minjie Jia, Ling Wang, Guowei Ma
Summary: This study verifies the feasibility of electric activation (EA) curing method in manufacturing reinforced concrete beams under negative temperature, and clarifies the effects of stirrup on electrical and heating performances. The experimental results show that more stirrups can increase the curing temperature and heating rate, and the proper stirrup arrangement form is beneficial for the performance of the beams.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Yaoyao Wu, Yanru Wang, Xiongfei Liu, Guowei Ma
Summary: This paper systematically explores the combined effects of different metasurface and layered structures on electromagnetic wave absorption performance of geopolymer material. Gradient layers are used to optimize the impedance matching, while metasurface with periodic pyramidal or cuboid elements further improves the absorption performance. COMSOL simulations verify the effectiveness of the integrated design method.
JOURNAL OF BUILDING ENGINEERING
(2023)